Possible experimental signature of octupole correlations in the 0+2 states of the actinides
Abstract
Jπ= 0+ states have been investigated in the actinide nucleus 240Pu up to an excitation energy of 3 MeV with a high-resolution (p,t) experiment at Ep= 24 MeV. To test the recently proposed Jπ= 0+2 double-octupole structure, the phenomenological approach of the spdf-interacting boson model has been chosen. In addition, the total 0+ strength distribution and the 0+ strength fragmentation have been compared to the model predictions as well as to the previously studied (p,t) reactions in the actinides. The results suggest that the structure of the 0+2 states in the actinides might be more complex than the usually discussed pairing isomers. Instead, the octupole degree of freedom might contribute significantly. The signature of two close-lying 0+ states below the 2-quasiparticle energy is presented as a possible manifestation of strong octupole correlations in the structure of the 0+2 states in the actinides.
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